Option for pagination to generate permalinks

[ppetrid]

It would be nice to be able to have our pagination urls be of the form my-slug/page/2/ instead of my-slug/?page=2. This would be great for SEO-friendly blogs (since the former would be a permalink, the latter is not), and I think it's an option that other popular engines (e.g. Wordpress) provide out of the box.

I have a pretty straight-forward implementation in my fork, where the pagination url style is saved as a config option. Let me know if you're interested in creating a pull request (only tests and migration are missing).